生态学杂志2013，Vol.32Issue(2)：311-318,8.
天山南坡中段高寒草地物种多样性与生物量的垂直分异特征
Vertical differentiation of plant species diversity and biomass in alpine grassland in the middle section of Tianshan Mountains southern slope, Xinjiang of Northwest China
摘要
Abstract
Elevation is one of the decisive factors of mountain plant species, population, commu-nity, and ecosystem. In this paper, an investigation was conducted on the changes of plant diver-sity and biomass in alpine grassland along an elevation gradient (2460-3260 m) on the southern slope of Tianshan Mountains. With the increase of elevation, environmental factors changed. The species richness index and Simpson dominance index appeared a unimodal pattern and peaked at the altitudes 3060 m and 2760 m, respectively, and the Shannon index and evenness index increased. The biomass also presented a unimodal pattern, and the above- and belowground bio-mass peaked at altitudes 3160 m and 3060 m, respectively. Our results supported the "interme-diate height expansion" theory. The belowground biomass was mainly concentrated in 0-10 cm soil layer, accounting for 63. 4% -94. 1% of the total belowground biomass, and the average root/shoot ratio was 62. Air temperature and soil water content were the main environmental fac-tors affecting the species diversity. Besides water and heat factors, soil pH was the factor limiting the plant growth, whereas soil available P was the factor limiting the plant root growth. Correlation analysis indicated that species richness was very significantly correlated with aboveground biomass and significantly correlated with belowground biomass, Shannon index was significantly correlated with aboveground biomass, and species diversity had a linear correlation with total biomass.关键词
高寒草地/海拔/环境因子/物种多样性/生物量Key words
alpine grassland/altitude/environmental factor/species diversity/biomass分类
农业科技引用本文复制引用
柳妍妍,胡玉昆,王鑫,公延明..天山南坡中段高寒草地物种多样性与生物量的垂直分异特征[J].生态学杂志,2013,32(2):311-318,8.基金项目
国家重点基础研究发展计划项目(2009CB825103)资助. （2009CB825103）
